function [endogenousvariables, info] = sim1_purely_forward(endogenousvariables, exogenousvariables, steadystate, M, options)
% Performs deterministic simulation of a purely forward model

% Copyright (C) 2012-2017 Dynare Team
%
% This file is part of Dynare.
%
% Dynare is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% Dynare is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with Dynare.  If not, see <https://www.gnu.org/licenses/>.

ny0 = nnz(M.lead_lag_incidence(1,:));    % Number of variables at current period
iyf = find(M.lead_lag_incidence(2,:)>0); % Indices of variables at next period

if ny0 ~= M.endo_nbr
    error('All endogenous variables must appear at the current period!')
end

dynamicmodel = str2func([M.fname,'.dynamic']);

info.status = 1;

for it = options.periods:-1:1
    yf = endogenousvariables(:,it+1); % Values at next period, also used as guess value for current period
    yf1 = yf(iyf);
    % TODO Call dynare_solve instead.
    [tmp, check] = solve1(dynamicmodel, [yf; yf1], 1:M.endo_nbr, 1:M.endo_nbr, ...
                          1, options.gstep, options.dynatol.f, ...
                          options.dynatol.x, options.simul.maxit, [], ...
                          options.debug, exogenousvariables, M.params, steadystate, ...
                          it+M.maximum_lag);
    if check
        info.status = 0;
    end
    endogenousvariables(:,it) = tmp(1:M.endo_nbr);
end